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308                 Bibliography
Bauer's introduction to his book, as follows: " The desire of the publishers to present to the German public a work on precious stones, similar in char­acter to that admirably supplied in American literature by George Frederic Kunz's Gems and Precious Stones of North America, gave the initia­tive to the writing of the present book." That the foremost expert on American gems should be an American, designated as its official authority by the United States Government, and accepted as such abroad, and that this American should possess the literary ability to disseminate the knowledge he has gathered in a popular as well as strictly scien­tific fashion, and should have directly caused the production of the most authoritative book on the gem subject, may be a source of satisfaction to his compatriots who are patriotic in all things as well as admirers of gems.
The basis of much of the information extant about gems is the old, but reliable and still stand­ard, A System of Mineralogy, by James Dwight Dana, published in 1837, in New Haven, Conn. This text-book, supplemented with Bauer's great book, and with the addition of Kunz's Gems and Precious Stones of North America to cover the phase of the general subject involving American gems, contains all important facts about gems and gem minerals, exclusive of recent mineralogical and other pertinent scientific discoveries. A valuable associate to this trio would be the Descriptive Catalogue of the Collections of Gems in the United States National Museum, by Wirt Tassin, Assistant Curator of the Division of Mineralogy. This was reprinted by the Government Printing Office at